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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3491: [FLINK-5804] [table] Add support for procTime non-...
Date Wed, 08 Mar 2017 09:30:52 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3491#discussion_r104874829
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/UnboundedNonPartitionedProcessingOverProcessFunction.scala
---
    @@ -0,0 +1,107 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.table.runtime.aggregate
    +
    +import org.apache.flink.api.common.state.{ListState, ListStateDescriptor}
    +import org.apache.flink.api.java.typeutils.RowTypeInfo
    +import org.apache.flink.configuration.Configuration
    +import org.apache.flink.runtime.state.{FunctionInitializationContext, FunctionSnapshotContext}
    +import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction
    +import org.apache.flink.streaming.api.functions.ProcessFunction
    +import org.apache.flink.table.functions.{Accumulator, AggregateFunction}
    +import org.apache.flink.types.Row
    +import org.apache.flink.util.{Collector, Preconditions}
    +
    +/**
    +  * Process Function used for the aggregate in
    +  * [[org.apache.flink.streaming.api.datastream.DataStream]]
    +  *
    +  * @param aggregates the list of all [[org.apache.flink.table.functions.AggregateFunction]]
    +  *                   used for this aggregation
    +  * @param aggFields  the position (in the input Row) of the input value for each aggregate
    +  */
    +class UnboundedNonPartitionedProcessingOverProcessFunction(
    +    private val aggregates: Array[AggregateFunction[_]],
    +    private val aggFields: Array[Int],
    +    private val forwardedFieldCount: Int,
    +    private val aggregationStateType: RowTypeInfo)
    +  extends ProcessFunction[Row, Row] with CheckpointedFunction{
    +
    +  Preconditions.checkNotNull(aggregates)
    +  Preconditions.checkNotNull(aggFields)
    +  Preconditions.checkArgument(aggregates.length == aggFields.length)
    +
    +  private var accumulators: Row = _
    +  private var output: Row = _
    +  private var state: ListState[Row] = null
    +
    +  override def open(config: Configuration) {
    +    output = new Row(forwardedFieldCount + aggregates.length)
    +  }
    +
    +  override def processElement(
    +    input: Row,
    +    ctx: ProcessFunction[Row, Row]#Context,
    +    out: Collector[Row]): Unit = {
    +
    +    if (null == accumulators) {
    --- End diff --
    
    Can we move this into `open()`?


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